CN109791302B - Optical coupling device and control method thereof - Google Patents
Optical coupling device and control method thereof Download PDFInfo
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- CN109791302B CN109791302B CN201680089616.8A CN201680089616A CN109791302B CN 109791302 B CN109791302 B CN 109791302B CN 201680089616 A CN201680089616 A CN 201680089616A CN 109791302 B CN109791302 B CN 109791302B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
- G02B6/2713—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters cascade of polarisation selective or adjusting operations
- G02B6/272—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters cascade of polarisation selective or adjusting operations comprising polarisation means for beam splitting and combining
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/02—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/281—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for attenuating light intensity, e.g. comprising rotatable polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/12004—Combinations of two or more optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/126—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind using polarisation effects
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/268—Optical coupling means for modal dispersion control, e.g. concatenation of light guides having different modal dispersion properties
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
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Abstract
An embodiment of the present invention provides an optical coupling device and a control method thereof, where the optical coupling device includes: the coupling and polarization separator, the phase shifter, the 2x2 adjustable beam splitter, the photoelectric detector and the microprocessor can realize the coupling of light in any polarization direction into the waveguide from the optical fiber, have small additional insertion loss, have the same inherent insertion loss of light in different polarization directions, have simple structure and are easy to realize miniaturization.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to an optical coupling device and a control method thereof.
Background
At present, silicon optical applications are developing towards high density, wavelength division and the like, wherein key devices such as waveguide array gratings (AWG), microrings and other refractive index sensitive devices have strong polarization dependence, and polarization-independent coupling is particularly important.
One existing polarization independent coupling method is: the method comprises the steps of firstly coupling light in an optical fiber into a waveguide by using a two-dimensional coupling grating (2DGC) to obtain two beams of Transverse Electric (TE) polarized light, then carrying out phase control on the two beams of TE polarized light by using a phase shifter to enable the phase difference of the two beams of TE polarized light to be 0, then combining the two beams of TE polarized light with the phase difference of 0 by using a 1x2 beam splitter, and finally obtaining one beam of TE polarized light.
In the above method, since light of any polarization direction exists in the optical fiber, the inherent insertion loss is 0 for TE/TM uniformly mixed polarized light, and the inherent insertion loss is 3dB for pure TE or TM polarized light, the inherent insertion loss is different for light of different polarization directions, and the extra insertion loss is large.
Disclosure of Invention
Embodiments of the present invention provide an optical coupling device and a control method thereof, which can couple light with any polarization direction from an optical fiber into a waveguide, and have small additional insertion loss.
In a first aspect, an embodiment of the present invention provides an optical coupling device, including:
the device comprises a coupling and polarization separator, a phase shifter, a 2x2 adjustable beam splitter, a photoelectric detector and a microprocessor, wherein the coupling and polarization separator is used for coupling light into a waveguide from an optical fiber, carrying out polarization beam splitting and rotation to obtain a first transverse electric TE polarized light beam and a second TE polarized light beam with phase difference, and the intensity ratio of the first TE polarized light beam to the second TE polarized light beam is a1∶a2(ii) a The phase shifter is used for adjusting the phase difference of the first beam of TE polarized light and the second beam of TE polarized light according to the working voltage; the 2x2 adjustable beam splitter is used for adjusting the splitting ratio according to the working voltage and carrying out beam combination processing on the first beam of TE polarized light and the second beam of TE polarized light according to the splitting ratio to obtain a first path of output and a second path of output; the photoelectric detector is used for detecting the working current output by the first path and sending the working current to the microprocessor; the microprocessor is used for adjusting the working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter according to the received working current.
The optical coupling device provided by the embodiment of the invention is provided with a coupling and polarization separator, a phase shifter, a 2x2 adjustable beam splitter, a photoelectric detector and a microprocessor, wherein the coupling and polarization separator couples light from an optical fiber into a waveguide and performs polarization beam splitting to obtain a first TE polarized light beam and a second TE polarized light beam with phase difference, then the phase difference of the two polarized light beams is adjusted through the phase shifter, then the two polarized light beams are combined through the 2x2 adjustable beam splitter to obtain two paths of output, the photoelectric detector detects working current output by the first path and feeds back the working current detected by the microprocessor, the microprocessor controls the voltage of the phase shifter 12 according to the received working current and adjusts the working voltage of the 2x2 adjustable beam splitter 13 to enable the working current output by the first path to be close to a theoretical value of 0, so that light in any polarization direction can be coupled into the waveguide from the optical fiber, the additional insertion loss is small, the structure is simple, and the miniaturization is easy to realize.
In one possible design, the coupling and polarization splitter is a spot size converter for coupling light from the optical fiber into the waveguide and a polarization rotating beam splitter for performing polarization splitting and rotation to obtain a first transverse electric TE polarized light beam and a second TE polarized light beam having a phase difference.
In the design, compared with a two-dimensional coupling grating, the two-dimensional coupling grating adopts the spot size converter and the polarization rotating beam splitter, so that a very wide wave band can be covered, and the optical bandwidth is wide.
In one possible design, the coupling and polarization splitter is a two-dimensional coupling grating.
In one possible design, the microprocessor is specifically configured to: the operating voltage of the phase shifter and the operating voltage of the 2x2 tunable beam splitter are adjusted until the operating current is less than or equal to a preset threshold.
In one possible design, the microprocessor is specifically configured to: and adjusting the working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter according to the target working voltage of the phase shifter and the target working voltage of the 2x2 adjustable beam splitter, wherein the target working voltage of the phase shifter and the target working voltage of the 2x2 adjustable beam splitter are the corresponding working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter when the working current is minimum.
In a second aspect, an embodiment of the present invention provides a method for controlling an optical coupling apparatus, where the optical coupling apparatus includes a coupling and polarization splitter, a phase shifter, a 2 × 2 tunable beam splitter, and a photodetector, the method includes: receiving the working current of the first output of the photoelectric detector, wherein the first output is the coupling and polarization separator for coupling the light from the optical fiber into the waveguide,performing polarization beam splitting and rotation to obtain a first transverse electric TE polarized light beam and a second TE polarized light beam with phase difference, performing phase difference adjustment through a phase shifter, and performing beam combination processing through a 2x2 adjustable beam splitter to obtain one of two output paths, wherein the intensity ratio of the first TE polarized light beam to the second TE polarized light beam is a1∶a2The operating voltage of the phase shifter is adjusted according to the operating current and the operating voltage of the 2x2 tunable beam splitter is adjusted according to the operating current.
According to the control method of the optical coupling device provided by the embodiment of the invention, the microprocessor is used for controlling the voltage of the phase shifter according to the received working current and adjusting the working voltage of the 2x2 adjustable beam splitter, so that the power of the first path of output light is close to a theoretical value of 0, and therefore, light in any polarization direction can be coupled into a waveguide from an optical fiber, and the extra insertion loss is small.
In one possible design, the coupling and polarization splitter is a spot size converter for coupling light from the optical fiber into the waveguide and a polarization rotating beam splitter for performing polarization splitting and rotation to obtain a first transverse electric TE polarized light beam and a second TE polarized light beam having a phase difference.
In the design, compared with a two-dimensional coupling grating, the two-dimensional coupling grating adopts the spot size converter and the polarization rotating beam splitter, so that a very wide wave band can be covered, and the optical bandwidth is wide.
In one possible design, the coupling and polarization splitter is a two-dimensional coupling grating.
In one possible design, adjusting the operating voltage of the phase shifter and the operating voltage of the 2x2 tunable beam splitter according to the operating current includes: the operating voltage of the phase shifter and the operating voltage of the 2x2 tunable beam splitter are adjusted until the operating current is less than or equal to a preset threshold.
In one possible design, adjusting the operating voltage of the phase shifter and the operating voltage of the 2x2 tunable beam splitter according to the operating current includes: and adjusting the working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter according to the target working voltage of the phase shifter and the target working voltage of the 2x2 adjustable beam splitter, wherein the target working voltage of the phase shifter and the target working voltage of the 2x2 adjustable beam splitter are the corresponding working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter when the working current is minimum.
In a third aspect, an embodiment of the present invention provides a method for controlling an optical coupling apparatus, where the optical coupling apparatus includes a coupling and polarization splitter, a phase shifter, a 2 × 2 adjustable beam splitter, and a photodetector, and the method includes:
the coupling and polarization separator couples light from the optical fiber into the waveguide, and performs polarization beam splitting and rotation to obtain a first transverse electric TE polarized light beam and a second TE polarized light beam with phase difference, wherein the intensity ratio of the first TE polarized light beam to the second TE polarized light beam is a1∶a2The phase shifter adjusts the phase difference between the first beam of TE polarized light and the second beam of TE polarized light according to the working voltage, the 2x2 adjustable beam splitter is used for adjusting the splitting ratio according to the working voltage and performing beam combination processing on the first beam of TE polarized light and the second beam of TE polarized light according to the splitting ratio to obtain a first output and a second output, the photoelectric detector is used for detecting the working current output by the first output and sending the working current to the microprocessor, and finally the microprocessor is used for adjusting the working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter according to the received working current.
The method for controlling the optical coupling device provided by the embodiment of the invention comprises the steps of coupling light into a waveguide from an optical fiber through a coupling and polarization separator, carrying out polarization beam splitting to obtain a first TE polarized light beam and a second TE polarized light beam with phase difference, adjusting the phase difference of the two TE polarized light beams through a phase shifter, carrying out beam combination processing through a 2x2 adjustable beam splitter to obtain two paths of output, detecting the working current output by the first path through a photoelectric detector, feeding back the working current detected by a microprocessor, controlling the voltage of the phase shifter 12 according to the received working current through the microprocessor, and adjusting the working voltage of the 2x2 adjustable beam splitter 13 to enable the working current output by the first path to be close to a theoretical value of 0, so that the light in any polarization direction can be coupled into the waveguide from the optical fiber, the additional insertion loss is small, the structure is simple, and the miniaturization is easy to realize.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a first embodiment of an optical coupling device according to the present invention;
FIG. 2 is a schematic structural diagram of a second embodiment of an optical coupling device according to the present invention;
fig. 3 is a flowchart of a first embodiment of a method for controlling an optical coupling device according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The optical coupling device and the control method thereof provided by the embodiment of the invention are used for polarization-independent coupling of a silicon optical chip, couple light (such as linearly polarized light, circular/elliptical polarized light and the like) in any polarization direction into a waveguide from an optical fiber, have small additional insertion loss, and have simple structure and are easy to realize miniaturization. The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a first embodiment of an optical coupling device according to the present invention, as shown in fig. 1, the optical coupling device includes: a coupling and polarization separator 11, a phase shifter 12, a 2x2 tunable beam splitter 13, a photodetector 14, and a microprocessor 15, wherein the coupling and polarization separator 11 is used for coupling light from an optical fiber into a waveguide, and performing polarization beam splitting and polarization rotation to obtain a first beam of transverse electric TE polarized light with a phase differenceAnd a second beam of TE polarized light, the intensity ratio of the first and second beams of TE polarized light being a1∶a2. The phase shifter 12 is used for adjusting the phase difference between the first beam of TE polarized light and the second beam of TE polarized light according to the operating voltage. The 2x2 adjustable beam splitter 13 is configured to adjust a splitting ratio according to the working voltage, and perform beam combination processing on the first beam of TE polarized light and the second beam of TE polarized light according to the splitting ratio to obtain a first output and a second output. The photodetector 14 is configured to detect the working current output by the first path, and send the working current to the microprocessor. The microprocessor 15 is used to adjust the operating voltage of the phase shifter and the operating voltage of the 2x2 tunable beam splitter according to the received operating current.
Optionally, the coupling and polarization splitter 11 may be a two-dimensional coupling grating, and the two-dimensional coupling grating may couple light from an optical fiber into the waveguide and perform polarization beam splitting to obtain the first TE polarized light beam and the second TE polarized light beam having a phase difference, but optical bandwidth may be reduced by adopting grating coupling, and therefore, in the embodiment of the present invention, the coupling and polarization splitter 11 may be a spot size converter and a polarization rotation beam splitter.
Fig. 2 is a schematic structural diagram of a second embodiment of an optical coupling device according to the present invention, as shown in fig. 2, based on the optical coupling device shown in fig. 1, further, the coupling and polarization splitter of the present embodiment includes a spot size converter 111 and a polarization rotation beam splitter 112, the spot size converter 111 is used for coupling light from an optical fiber into a waveguide, and the polarization rotation beam splitter 112 is used for performing polarization beam splitting and rotation, so as to obtain a first transverse electric TE polarized light beam and a second transverse electric TE polarized light beam having a phase difference. Compared with a two-dimensional coupling grating, the two-dimensional coupling grating can cover a very wide waveband by adopting the spot size converter and the polarization rotating beam splitter, and the optical bandwidth is wide.
In the above embodiment, as an optional implementation, the microprocessor 15 is specifically configured to: adjusting the working voltage of the phase shifter 12 and the working voltage of the 2x2 adjustable beam splitter 13 until the working current is less than or equal to a preset threshold, specifically, for example, after receiving the working current output from the first path, determining whether the working current is less than or equal to the preset threshold, and if the working current is less than or equal to the preset threshold, respectively taking the current working voltage of the phase shifter 12 and the working voltage of the 2x2 adjustable beam splitter 13 as target working voltages of the two; if not, the operating voltage of the phase shifter 12 and the operating voltage of the 2x2 tunable beam splitter 13 are continuously adjusted. The preset threshold is experimental data, and the theoretical value is 0.
As another alternative, the microprocessor 15 is specifically configured to:
and adjusting the working voltage of the phase shifter 12 and the working voltage of the 2x2 adjustable beam splitter 13 according to the target working voltage of the phase shifter 12 and the target working voltage of the 2x2 adjustable beam splitter 13, wherein the target working voltage of the phase shifter 12 and the target working voltage of the 2x2 adjustable beam splitter 13 are the corresponding working voltage of the phase shifter 12 and the working voltage of the 2x2 adjustable beam splitter 13 when the working current is minimum. For example, the minimum operating current is specifically determined by: the minimum value of the first path of output working current corresponding to N different working voltages of the phase shifter 12 working in a first preset range and N different working voltages of the 2x2 adjustable beam splitter 13 working in a second preset range is determined, the working voltage of the phase shifter 12 corresponding to the minimum value of the first path of output working current is used as the target working voltage of the phase shifter 12, and the working voltage of the 2x2 adjustable beam splitter 13 corresponding to the minimum value of the first path of output working current is used as the target working voltage of the 2x2 adjustable beam splitter 13. The first preset range and the second preset range can be close to the theoretical value 0 of the working current output by the first channel.
The following describes in detail the technical principle of adjusting the working voltage of the phase shifter 12 and the working voltage of the 2 × 2 tunable beam splitter 13 to make the optical power output by the first path be 0, by taking the coupling and polarization splitter 11 as a spot size converter and a polarization rotating beam splitter as an example:
light of any polarization direction in the fiber can be represented by jones matrix as:
A spot-size converter (SSC) for converting light from lightAfter the fiber coupled wave-in is conducted through a polarization rotation beam splitter (PSR), a first beam of TE polarized light and a second beam of TE polarized light with phase difference are obtained, and the intensity ratio of the first beam of TE polarized light to the second beam of TE polarized light is a1∶a2Then passing through the phase shifter 12, the voltage of the phase shifter 12 is controlled by the microprocessor 15, so that the phase of the first beam of TE polarized light is controlled
That is, the phase difference between the two beams of polarized light is pi/2, the electric vectors of the first beam of TE polarized light and the second beam of TE polarized light are:
then, the light passes through a 2X2 adjustable beam splitter 13 (splitting ratio is 1: X), so that:
the operating voltage of the 2X2 tunable optical splitter 13 is adjusted such that X ═ a1/a2I.e. a1-xa2After the 2 × 2 adjustable beam splitter 13 performs beam combining processing, the electric vector output by the first path and the electric vector output by the second path are obtained as follows:
i.e. the optical power of the second output is
I.e. theoretically introducing an extra loss of 0; the optical power of the first path is 0, the first path is output to the photodetector 14, the output of the first path can be detected by the photodetector 14 for feedback control, if the optical power of the first path is 0, the working current of the first path is 0, 0 is a theoretical value, and a current threshold value can be preset, so that when the working current fed back to the microprocessor 15 by the photodetector 14 is greater than the preset threshold value, the working current of the phase shifter 12 is continuously adjustedThe working voltage and the working voltage of the 2x2 adjustable beam splitter 13 further change the working current output by the first path, and if the working voltage and the working voltage of the 2x2 adjustable beam splitter are less than or equal to a preset threshold, the working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter are stopped being adjusted.
The optical coupling device provided by this embodiment is provided with a coupling and polarization separator, a phase shifter, a 2x2 adjustable beam splitter, a photodetector and a microprocessor, wherein the coupling and polarization separator couples light from an optical fiber to a waveguide, performs polarization beam splitting to obtain a first TE polarized light beam and a second TE polarized light beam with a phase difference, then adjusts the phase difference of the two TE polarized light beams through the phase shifter, and then performs beam combining processing through the 2x2 adjustable beam splitter to obtain two paths of output, the photodetector detects a working current output by the first path, feeds back the working current detected by the microprocessor, controls a voltage of the phase shifter 12 according to the received working current through the microprocessor, adjusts a working voltage of the 2x2 adjustable beam splitter 13, so that the working current output by the first path is close to a theoretical value of 0, and thus light with any polarization direction can be coupled from the optical fiber to the waveguide, the additional insertion loss is small, the structure is simple, and the miniaturization is easy to realize.
Fig. 3 is a flowchart of a first embodiment of a method for controlling an optical coupling device, as shown in fig. 3, the present embodiment is applied to an optical coupling device including a coupling and polarization splitter, a phase shifter, a 2x2 tunable beam splitter, and a photodetector, and the method of the present embodiment includes:
and S101, receiving the working current output by the first path detected by the photoelectric detector.
The first output is one of two outputs obtained by coupling light from an optical fiber to a waveguide by a coupling and polarization separator, performing polarization beam splitting and rotation to obtain a first transverse electric TE polarized light beam and a second TE polarized light beam with phase difference, performing phase difference adjustment by a phase shifter, and performing beam combination by a 2x2 adjustable beam splitter, wherein the intensity ratio of the first TE polarized light beam to the second TE polarized light beam is a1∶a2。
And S102, adjusting the working voltage of the phase shifter according to the working current and adjusting the working voltage of the 2x2 adjustable beam splitter.
Optionally, the coupling and polarization splitter is a two-dimensional coupling grating. The two-dimensional coupling grating can couple light from the optical fiber into the waveguide and perform polarization beam splitting to obtain a first TE polarized light beam and a second TE polarized light beam with a phase difference, but the optical bandwidth can be reduced by adopting grating coupling, so in the embodiment of the invention, the coupling and polarization separator can be a spot size converter and a polarization rotation beam splitter, the spot size converter is used for coupling light from the optical fiber into the waveguide, and the polarization rotation beam splitter is used for performing polarization beam splitting and rotation to obtain a first transverse electric TE polarized light beam and a second TE polarized light beam with a phase difference. Compared with a two-dimensional coupling grating, the two-dimensional coupling grating can cover a very wide waveband by adopting the spot size converter and the polarization rotating beam splitter, and the optical bandwidth is wide.
As an optional implementation manner, S102 is specifically: adjusting the working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter until the working current is less than or equal to a preset threshold, specifically, for example, after receiving the working current output from the first path, determining whether the working current is less than or equal to the preset threshold, and if the working current is less than or equal to the preset threshold, respectively taking the current working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter as target working voltages of the phase shifter and the 2x2 adjustable beam splitter; if not, the working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter are continuously adjusted. The preset threshold is experimental data, and the theoretical value is 0.
As another optional implementation, S102 specifically is: and adjusting the working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter according to the target working voltage of the phase shifter and the target working voltage of the 2x2 adjustable beam splitter, wherein the target working voltage of the phase shifter and the target working voltage of the 2x2 adjustable beam splitter are the corresponding working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter when the working current is minimum. For example, the minimum operating current is specifically determined by: the method comprises the steps of determining the minimum value of the working current output by a first path corresponding to N different working voltages of a phase shifter working in a first preset range and N different working voltages of a 2x2 adjustable beam splitter working in a second preset range, taking the working voltage of the phase shifter corresponding to the minimum value of the working current output by the first path as the target working voltage of the phase shifter, and taking the working voltage of the 2x2 adjustable beam splitter corresponding to the minimum value of the working current output by the first path as the target working voltage of the 2x2 adjustable beam splitter. The first preset range and the second preset range can be close to the theoretical value 0 of the working current output by the first channel.
The above-mentioned device embodiment is a technical principle component that the working voltage of the phase shifter and the working voltage of the 2 × 2 adjustable beam splitter are adjusted to make the optical power output by the first path be 0, and details are not repeated here.
In the control method of the optical coupling device provided in this embodiment, the microprocessor controls the voltage of the phase shifter according to the received working current, and adjusts the working voltage of the 2 × 2 adjustable beam splitter, so that the output optical power of the first path is close to the theoretical value 0, and thus light with any polarization direction can be coupled into the waveguide from the optical fiber, and the extra insertion loss is small.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
As will be appreciated by one of ordinary skill in the art, various aspects of the present application, or possible implementations of various aspects, may be embodied as a system, method, or computer program product. Accordingly, aspects of the present application, or possible implementations of aspects, may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, etc.) or an embodiment combining software and hardware aspects that may all generally be referred to herein as a "circuit," module "or" system. Furthermore, aspects of the present application, or possible implementations of aspects, may take the form of a computer program product referring to computer readable program code stored in a computer readable medium.
The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing, such as Random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, and portable read-only memory (CD-ROM).
A processor in the computer reads the computer-readable program code stored in the computer-readable medium, so that the processor can perform the functional actions specified in each step, or a combination of steps, in the flowcharts; and means for generating a block diagram that implements the functional operation specified in each block or a combination of blocks.
The computer readable program code may execute entirely on the user's local computer, partly on the user's local computer, as a stand-alone software package, partly on the user's local computer and partly on a remote computer or entirely on the remote computer or server. It should also be noted that, in some alternative implementations, the functions noted in the flowchart or block diagram block may occur out of the order noted in the figures. For example, two steps or two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include such modifications and variations.
Claims (8)
1. A light coupling device, comprising:
a coupling and polarization separator, a phase shifter, a 2x2 adjustable beam splitter, a photodetector, and a microprocessor;
the coupling and polarization separator is used for separating light fromThe optical fiber is coupled into the waveguide, and polarization beam splitting and rotation are carried out to obtain a first beam of TE polarized light and a second beam of TE polarized light with phase difference, wherein the intensity ratio of the first beam of TE polarized light to the second beam of TE polarized light is a1:a2；
The phase shifter is used for adjusting the phase difference of the first beam of TE polarized light and the second beam of TE polarized light according to the working voltage;
the 2x2 adjustable beam splitter is used for adjusting a splitting ratio according to a working voltage and carrying out beam combination processing on the first beam of TE polarized light and the second beam of TE polarized light according to the splitting ratio to obtain a first path of output and a second path of output;
the photoelectric detector is used for detecting the working current output by the first path and sending the working current to the microprocessor;
the microprocessor is used for adjusting the working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter according to the received working current;
the microprocessor is specifically configured to:
adjusting the operating voltage of the phase shifter and the operating voltage of the 2x2 tunable beam splitter until the operating current is less than or equal to a preset threshold.
2. The light coupling device of claim 1, wherein the coupling and polarization splitter is a spot-size converter and a polarization rotating beam splitter;
the spot-size converter is used for coupling light from the optical fiber into the waveguide;
the polarization rotation beam splitter is used for carrying out polarization beam splitting and rotation to obtain a first beam of TE polarized light and a second beam of TE polarized light with phase difference.
3. The light coupling device of claim 1, wherein the coupling and polarization splitter is a two-dimensional coupling grating.
4. The light coupling device according to any one of claims 1-3, wherein the microprocessor is specifically configured to:
and adjusting the working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter according to the target working voltage of the phase shifter and the target working voltage of the 2x2 adjustable beam splitter, wherein the target working voltage of the phase shifter and the target working voltage of the 2x2 adjustable beam splitter are the corresponding working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter when the working current is minimum.
5. A method of controlling an optical coupling device comprising a coupling and polarization splitter, a phase shifter, a 2x2 tunable beam splitter, and a photodetector, the method comprising:
receiving the working current of a first path output detected by the photoelectric detector, wherein the first path output is one of two paths of outputs obtained by coupling light from an optical fiber into a waveguide by the coupling and polarization separator, performing polarization beam splitting and rotation to obtain a first TE polarized light beam and a second TE polarized light beam with phase difference, performing phase difference adjustment by the phase shifter, and performing beam combination processing by the 2x2 adjustable beam splitter, and the intensity ratio of the first TE polarized light beam to the second TE polarized light beam is a1:a2；
Adjusting the working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter according to the working current;
the adjusting the operating voltage of the phase shifter and the operating voltage of the 2x2 tunable beam splitter according to the operating current includes:
adjusting the operating voltage of the phase shifter and the operating voltage of the 2x2 tunable beam splitter until the operating current is less than or equal to a preset threshold.
6. The method of claim 5, wherein the coupling and polarization splitter is a spot size converter and a polarization rotating beam splitter;
the spot-size converter is used for coupling light from the optical fiber into the waveguide;
the polarization rotation beam splitter is used for carrying out polarization beam splitting and rotation to obtain a first beam of TE polarized light and a second beam of TE polarized light with phase difference.
7. The method of claim 5, wherein the coupling and polarization splitter is a two-dimensional coupling grating.
8. The method of any of claims 5-7, wherein said adjusting an operating voltage of said phase shifter and an operating voltage of said 2x2 tunable beam splitter according to said operating current comprises:
and adjusting the working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter according to the target working voltage of the phase shifter and the target working voltage of the 2x2 adjustable beam splitter, wherein the target working voltage of the phase shifter and the target working voltage of the 2x2 adjustable beam splitter are the corresponding working voltage of the phase shifter and the working voltage of the 2x2 adjustable beam splitter when the working current is minimum.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2016/102314 WO2018072068A1 (en) | 2016-10-18 | 2016-10-18 | Optocoupler device and method for controlling same |
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| CN109791302A CN109791302A (en) | 2019-05-21 |
| CN109791302B true CN109791302B (en) | 2020-06-26 |
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| US (1) | US10948655B2 (en) |
| EP (1) | EP3514608B1 (en) |
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| US10761352B1 (en) * | 2019-09-11 | 2020-09-01 | Sicoya Gmbh | Optical device |
| CN111239936B (en) * | 2020-03-20 | 2021-10-15 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN114690451B (en) * | 2022-03-30 | 2024-04-19 | 华中科技大学 | Active polarization control system and method based on feedback control |
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| Publication number | Publication date |
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| US10948655B2 (en) | 2021-03-16 |
| WO2018072068A1 (en) | 2018-04-26 |
| EP3514608A4 (en) | 2019-09-25 |
| EP3514608B1 (en) | 2021-12-15 |
| CN109791302A (en) | 2019-05-21 |
| US20190243068A1 (en) | 2019-08-08 |
| EP3514608A1 (en) | 2019-07-24 |
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